Public bug reported:
Expecting: kernel initramfs compression.
Result: No compression options respeected.
I have the following in /etc/initramfs-tools/initramfs.conf :
COMPRESS=zstd
COMPRESSLEVEL=9
After process (A):
sudo update-initramfs -v -u
sudo grub-mkconfig -o /boot/grub/grub.cfg
sudo grub-mkconfig -o /boot/efi/EFI/ubuntu/grub.cfg
sudo update-grub2
sudo file /boot/initrd.img-6.14.0-23-generic
Result: /boot/initrd.img-6.14.0-23-generic: ASCII cpio archive (SVR4
with no CRC)
So no compression I assume.
I've also tried /etc/initramfs-tools/conf.d/zstd :
# Additional options for zstd compression
COMPRESSION=zstd
COMPRESSLEVEL=9
ZSTD_OPTIONS="-T0 -9 --long --auto-threads=logical"
Repeat process (A), no compression.
(I wanted to try the last line which informed me of this issue.)
Next, noticing we are moving over to dracut, without installing and replacing
initramfs-tools, dracut-core and dracut-install are yet provided due to other
dependencies. So I placed in /etc/dracut.conf.d/zstd.conf :
compress=zstd
compress_options="-T0 -9 --long --auto-threads=logical"
Repeat process (A), no compression.
I also tried changing the compression method to gzip, but it is all left
to not being compressed.
Have we let go of compression? I am sorry if this is a false bug.
apt-cache policy dracut-install
dracut-install:
Installed: 106-2ubuntu5
Candidate: 106-2ubuntu5
Version table:
*** 106-2ubuntu5 500
500 http://us.archive.ubuntu.com/ubuntu plucky/main amd64 Packages
100 /var/lib/dpkg/status
apt-cache policy dracut-core
dracut-core:
Installed: 106-2ubuntu5
Candidate: 106-2ubuntu5
Version table:
*** 106-2ubuntu5 500
500 http://us.archive.ubuntu.com/ubuntu plucky/universe amd64 Packages
100 /var/lib/dpkg/status
apt-cache policy initramfs-tools
initramfs-tools:
Installed: 0.147ubuntu1
Candidate: 0.147ubuntu1
Version table:
*** 0.147ubuntu1 500
500 http://us.archive.ubuntu.com/ubuntu plucky/main amd64 Packages
100 /var/lib/dpkg/status
uname -a
Linux anwiend 6.14.0-23-generic #23-Ubuntu SMP PREEMPT_DYNAMIC Fri Jun 13
23:02:20 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux
lsb_release -rd
Description: Ubuntu 25.04
Release: 25.04
Dracut package is not installed while I believe dracut-install and
dracut-core with /usr/bin/dracut does exist for cryptsetup-initramfs
dependencies.
** Affects: dracut (Ubuntu)
Importance: Undecided
Status: New
** Tags: dracut initramfs-tools zstd
** Package changed: nvidia-kernel-common (Ubuntu) => dracut (Ubuntu)
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https://bugs.launchpad.net/bugs/2116060
Title:
Initramfs Compression Options Not Respected in Ubuntu 25.04
Status in dracut package in Ubuntu:
New
Bug description:
Expecting: kernel initramfs compression.
Result: No compression options respeected.
I have the following in /etc/initramfs-tools/initramfs.conf :
COMPRESS=zstd
COMPRESSLEVEL=9
After process (A):
sudo update-initramfs -v -u
sudo grub-mkconfig -o /boot/grub/grub.cfg
sudo grub-mkconfig -o /boot/efi/EFI/ubuntu/grub.cfg
sudo update-grub2
sudo file /boot/initrd.img-6.14.0-23-generic
Result: /boot/initrd.img-6.14.0-23-generic: ASCII cpio archive (SVR4
with no CRC)
So no compression I assume.
I've also tried /etc/initramfs-tools/conf.d/zstd :
# Additional options for zstd compression
COMPRESSION=zstd
COMPRESSLEVEL=9
ZSTD_OPTIONS="-T0 -9 --long --auto-threads=logical"
Repeat process (A), no compression.
(I wanted to try the last line which informed me of this issue.)
Next, noticing we are moving over to dracut, without installing and replacing
initramfs-tools, dracut-core and dracut-install are yet provided due to other
dependencies. So I placed in /etc/dracut.conf.d/zstd.conf :
compress=zstd
compress_options="-T0 -9 --long --auto-threads=logical"
Repeat process (A), no compression.
I also tried changing the compression method to gzip, but it is all
left to not being compressed.
Have we let go of compression? I am sorry if this is a false bug.
apt-cache policy dracut-install
dracut-install:
Installed: 106-2ubuntu5
Candidate: 106-2ubuntu5
Version table:
*** 106-2ubuntu5 500
500 http://us.archive.ubuntu.com/ubuntu plucky/main amd64 Packages
100 /var/lib/dpkg/status
apt-cache policy dracut-core
dracut-core:
Installed: 106-2ubuntu5
Candidate: 106-2ubuntu5
Version table:
*** 106-2ubuntu5 500
500 http://us.archive.ubuntu.com/ubuntu plucky/universe amd64 Packages
100 /var/lib/dpkg/status
apt-cache policy initramfs-tools
initramfs-tools:
Installed: 0.147ubuntu1
Candidate: 0.147ubuntu1
Version table:
*** 0.147ubuntu1 500
500 http://us.archive.ubuntu.com/ubuntu plucky/main amd64 Packages
100 /var/lib/dpkg/status
uname -a
Linux anwiend 6.14.0-23-generic #23-Ubuntu SMP PREEMPT_DYNAMIC Fri Jun 13
23:02:20 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux
lsb_release -rd
Description: Ubuntu 25.04
Release: 25.04
Dracut package is not installed while I believe dracut-install and
dracut-core with /usr/bin/dracut does exist for cryptsetup-initramfs
dependencies.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/dracut/+bug/2116060/+subscriptions
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